$166 Samlex 1223 Power Supply
$142 Diamond X200A Antenna - Mount it above your roofline.
LMR-400 Coaxial Cable cost will depend on length. Buy the length you need with the connectors on it.
UV-50X2 User Manual
UV-50X2 Software or
Chirp Software
Alternatively:
There are probably less expensive power supplies, but ensure it will handle 20 amps, although your radio may not draw that much. A switching power supply will cost less than a linear power supply. A switching power supply will also save on electricity. If you have a 12v battery laying around, connect the radio directly to the battery. A trickle charger will keep it topped up.
If you want to save some money, you might be able to use a
magnet mount VHF/UHF antenna for $50. This will include the coax and you could place the antenna on a metal surface to give it a ground plane (19" radius from the center. More will help, less will hurt). You could also use it on your vehicle should you desire. While it is definitely not the best for simplex, it may work fine for monitoring and talking on the repeaters in your area. Just program in your local repeaters and let it scan. Again, should you decide to get more involved $$$ you can use the mobile antenna on the vehicle if you purchase an antenna to put above the roofline at home.
Also, avoid blasting 50 watts and start out with just 5 watts. It may be enough to hit the repeaters and you don't need that RF blasting into your noggin. Raise the antenna up into your rafters, on a ground plane, in your garage.
Have fun.